<spanclass="n">heading</span><spanclass="o">=</span><spanclass="s1">&#39;&lt;h1&gt;Last 500 records of parsing history of &quot;</span><spanclass="si">%s</span><spanclass="s1">&quot;&lt;/h1&gt;&#39;</span><spanclass="o">%</span><spanclass="n">log_file_name</span><spanclass="o">+</span><spanclass="n">lead_in</span>